11th century Alhazen shows that light travels in straight lines.
1630 René Descartes proposes a wave description of light.
1660 Robert Hooke states that light is a vibration of the medium through which it propagates.
1803 Thomas Young describes experiments that demonstrate how light behaves as a wave.
1864 James Clerk Maxwell predicts the speed of light and concludes that light is a form of electromagnetic wave.
1900s Albert Einstein and Max Planck show that light is both a particle and a wave. The quanta of electromagnetic radiation they recognize become known as “photons.”
In the 17th century, Isaac Newton and the ...